100mph HPI Vorza
This 2010 build wasn’t originally destined for 100mph; all we wanted to do was see how fast we could go with an HPI Vorza Flux RTR buggy and off-the-shelf parts, which was expected to be about 85mph. The stock speed control allowed for 6S power, but a 2650Kv motor replaced the 2200Kv stocker. Gearing was upped, the drivetrain was reinforced, and the diffs tuned for even power distribution. The Vorza had more power than traction but easily topped 86mph, with more speed on tap. Why not shoot for 100mph? With the addition of Imex foam tires to prevent tire ballooning, the ballistic buggy did the ton on the El Mirage lakebed—complete with moon discs on the wheels, like a proper lakester.
There’s a lot of tire spinning torque in that motor, and that was used to turn the drivetrain, with a very large 24-tooth Mod 1 pinion gear. This gear was used to get the highest gear ratio possible without having to modify the chassis. Normally 1/8-scale buggies sit about an inch off the ground, but when you’re trying to reach speeds of 100mph, you want to get it as low as possible to make it more aerodynamic. A big 2650Kv brushless motor was used to get the buggy up to speed. There’s a lot of cooling, thanks to the machining that was done to the can to increase its surface area. The motor mount was modified slightly to make the drivetrain as smooth as possible. Foam tires with 0.040-inch-thick aluminum caps were eventually used to get the buggy up to 100mph. The caps help reduce turbulence and drag around the wheels, which made the buggy go faster.